The OSI Model Layers and Their Functions

Each OSI layer has a specific function associated with the devices. This topic describes each layer and its functions.

The Seven Layers of the OSI Model

OSI Model layer

Layer 1: The Physical Layer

The physical layer handles all the specifications like electrical, mechanical,etc. for controlling the physical link between end systems.

Layer 2: The Data Link Layer

The data link layer has two major responsibilities: Formatting data for transmission and controlling access to the physical media. The two other functions of this layer are: error detection and correction in concern with the reliable delivery of the data.

Layer 3: The Network Layer

The network layer ensures connectivity and path selection between two host systems irrespective of their geographical location.

Layer 4: The Transport Layer

The transport layer segments data at the Sender side and reassembles the data at the receiver side. For example, larger Firms often transfer heavy files from one site to another.Transport layer ensures Reliable delivery of the files by breaking down large files into smaller segments that are less prone to transmission problems.

Layer 5: The Session Layer

The session layer regulates sessions between two communicating hosts. The session layer also synchronizes communication between the presentation layers of the two communicating hosts and manages their data exchange.

Layer 6: The Presentation Layer

The presentation layer certify that the information sent at the application layer of one system is readable by the application layer of another system.

Layer 7: The Application Layer

The application layer is the layer accessed by the user. This layer provides network services to the applications of the user which include e-mail, file transfer,etc.

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